H.264/AVC 是ITU-T VCEG 和ISO/IEC MPEG 共同開發的視頻處理標準，ITU-T作為標準建議H.264，ISO/IEC作為國際標準14496-10（MPEG-4 第10部分）高級視頻編碼（AVC）。

   MPEG-2視頻編碼標準（又稱為ITU-T H.262[2]）已有10年的歷史了，由MPEG-1擴充而來，支持隔行掃瞄。使用十分廣泛，幾乎用於所有的數字電視系統，適合標清和高清電視，適合各種媒體傳輸，包括衛星、有線、地面等，都能有效地傳輸。然而，類似xDSL、UMTS（通用移動系統）技術只能提供較小的傳輸速率，甚至DVB-T，也沒有足夠的頻段可用，提供的節目很有限，隨著高清電視的引入，迫切需要高壓縮比技術的出現。

   於是x264/H264應運而生了……

x264 is an open source H.264 (also known as MPEG-4 AVC) based video codec available for many platforms.

‧ x264 Full package come with an installer and contains both VFW and CLI with MeGUI.
- Microsoft .NET Framework 2.0, AVISynth and DGIndex are required to use MeGUI but NOT included.

Advanced Settings :

- Enabling Cabac: approximately 10% bitrate reduction without loss in quality, but is slow.
- Enabling De-blocking Filter: smooths out visible blocks during an encode (rather than by using post processing to smooth out blocks while decoding). Is a good idea to enable for low bitrate encodes.

x264 limitations :

- "x264 doesn't support the error-resilience features of baseline and extended profile, not the alternative colorspaces of high profile. Properly dealing with adaptive interlacing in all cases takes lots of code. x264 doesn't support interlacing.
There are a few other features not supported..."

Changes from x264 Video Codec rev. 464 to x264 rev. 468 :

- (r468) b16x16 wpred analysis used wrong weight
- (r467) configure: --enable-shared for libx264.so
- (r466) wrong modulus when delta_qp = +26
- (r465) 10l in vbv + 2pass
- (r464) macroblock-level ratecontrol: improved vbv strictness, and improved quality when using vbv.
- (r463) keep transposed dct coefs. ~1% overall speedup.

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‧ Important Note:
- Uninstall any previous build before installing this one.
‧ Related downloads:
- Haali Matroska Splitter: is a new DirectShow splitter, based on Haali's C library for .mkv (Matroska), .mp4, .ogg/.ogm and .avi handling.
- x263 Video Codec: is another H.263 video codec, developed by Xirlink and used by certain cams to compress AVI video.

附幾個x264相關知識帖（點擊即可進入相關頁面）：
縱覽最新視頻編碼標準H.264/AVC (簡體)
H.264視頻壓縮標準對測試技術提出的挑戰  (簡體)
用x264編製AVC教程放出 (簡體)
視頻編碼標準H.264的核心技術分析 (簡體)
H.264的碼率控制策略 (簡體)
MPEG-4 AVC/H.264編碼器薈萃（英文）


x264-525-install.rar

x264-537-install.rar



安裝與調用方法見各版本文件中附帶的說明。這裡提供三個版本，大家據自己情況選擇使用。

提示：最新的1.1.0.5版與1.0.0.0版區別（見圖），當 CoreAVC Pro v1.1.0.5版運行時，選擇左下方適合選項，會有優化效果。

1.0.0.0版




1.1.0.5版




CoreAVC1.0.0.0_Pro.rar

CoreAVC+Pro+v1.1.0.5.rar

CoreAVCDecoder.rar